WikiService.java

/*
 * Copyright (c) 2002-2023, City of Paris
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  1. Redistributions of source code must retain the above copyright notice
 *     and the following disclaimer.
 *
 *  2. Redistributions in binary form must reproduce the above copyright notice
 *     and the following disclaimer in the documentation and/or other materials
 *     provided with the distribution.
 *
 *  3. Neither the name of 'Mairie de Paris' nor 'Lutece' nor the names of its
 *     contributors may be used to endorse or promote products derived from
 *     this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * License 1.0
 */
package fr.paris.lutece.plugins.wiki.service;

import fr.paris.lutece.plugins.wiki.business.TopicVersion;
import fr.paris.lutece.plugins.wiki.service.parser.LuteceWikiParser;
import fr.paris.lutece.plugins.wiki.service.parser.SpecialChar;
import fr.paris.lutece.portal.service.cache.AbstractCacheableService;
import fr.paris.lutece.portal.service.util.AppLogService;


/**
 * Wiki Service
 */
public final class WikiService extends AbstractCacheableService
{
    private static final String SERVICE_CACHE_NAME = "Wiki Cache Service";

    private static WikiService _singleton;

    /** Private Constructor */
    private WikiService( )
    {
        initCache( );
    }

    /**
     * {@inheritDoc }
     */
    @Override
    public String getName( )
    {
        return SERVICE_CACHE_NAME;
    }

    /**
     * Returns the unique instance
     * 
     * @return The instance
     */
    public static WikiService instance( )
    {
        synchronized( WikiService.class )
        {
            if ( _singleton == null )
            {
                _singleton = new WikiService( );
            }
        }
        return _singleton;
    }

    /**
     * Get the Wiki page in HTML format
     * 
     * @param strPageName
     *            The page name
     * @param version
     *            The content version
     * @param strPageUrl
     *            The page URL
     * @param strLanguage
     *            The language
     * @return The HTML code
     */
    public String getWikiPage( String strPageName, TopicVersion version, String strPageUrl, String strLanguage )
    {
        StringBuilder sbKey = new StringBuilder( );
        sbKey.append( strPageName ).append( '[' ).append( version.getIdTopicVersion( ) ).append( ']' )
                .append( ( ( strPageUrl != null ) ? "[Url]" : "[noUrl]" ) ).append( ':' ).append( strLanguage );
        String strPageContent = (String) getFromCache( sbKey.toString( ) );
        synchronized( WikiService.class )
        {
            if ( strPageContent == null )
            {
                try {
                    if (version.getWikiContent(strLanguage).getHtmlWikiContent() != null) {
                        strPageContent = SpecialChar.renderWiki(version.getWikiContent(strLanguage).getHtmlWikiContent());
                        putInCache(sbKey.toString(), strPageContent);
                    } else {
                        String strContent = SpecialChar.renderWiki(version.getWikiContent(strLanguage).getWikiContent());
                        strPageContent = new LuteceWikiParser(strContent, strPageName, strPageUrl, strLanguage).toString();
                        putInCache(sbKey.toString(), strPageContent);
                    }
                }
                catch( NullPointerException e )
                {
                    AppLogService.error( "WikiService.getWikiPage : " + e.getMessage( ), e );
                }

            }
        }
        return strPageContent;
    }


    /**
     * Get the Wiki page in HTML format
     * 
     * @param strPageName
     *            The page name
     * @param version
     *            The topic version
     * @param strLanguage
     *            The language
     * @return The HTML code
     */
    public String getWikiPage( String strPageName, TopicVersion version, String strLanguage )
    {
        return getWikiPage( strPageName, version, null, strLanguage );
    }

}